linux-kernel - [PATCH 2/2] NET: cdc-phonet, handle empty phonet header

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Message-Id: <1300035271-8138-2-git-send-email-jslaby@suse.cz>
Date:	Sun, 13 Mar 2011 17:54:31 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	davem@...emloft.net
Cc:	jirislaby@...il.com, netdev@...r.kernel.org, gregkh@...e.de,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	Jiri Slaby <jslaby@...e.cz>,
	Rémi Denis-Courmont 
	<remi.denis-courmont@...ia.com>
Subject: [PATCH 2/2] NET: cdc-phonet, handle empty phonet header

Currently, for N 5800 XM I get:
cdc_phonet: probe of 1-6:1.10 failed with error -22

It's because phonet_header is empty. Extra altsetting looks like
there:
E 05 24 00 01 10 03 24 ab 05 24 06 0a 0b 04 24 fd  .$....$..$....$.
E 00                                               .

I don't see the header used anywhere so just check if the phonet
descriptor is there, not the structure itself.

Signed-off-by: Jiri Slaby <jslaby@...e.cz>
Cc: Rémi Denis-Courmont <remi.denis-courmont@...ia.com>
Cc: David S. Miller <davem@...emloft.net>
---
 drivers/net/usb/cdc-phonet.c |    9 +++------
 1 files changed, 3 insertions(+), 6 deletions(-)

diff --git a/drivers/net/usb/cdc-phonet.c b/drivers/net/usb/cdc-phonet.c
index 4cf4e36..f967913 100644
--- a/drivers/net/usb/cdc-phonet.c
+++ b/drivers/net/usb/cdc-phonet.c
@@ -328,13 +328,13 @@ int usbpn_probe(struct usb_interface *intf, const struct usb_device_id *id)
 {
 	static const char ifname[] = "usbpn%d";
 	const struct usb_cdc_union_desc *union_header = NULL;
-	const struct usb_cdc_header_desc *phonet_header = NULL;
 	const struct usb_host_interface *data_desc;
 	struct usb_interface *data_intf;
 	struct usb_device *usbdev = interface_to_usbdev(intf);
 	struct net_device *dev;
 	struct usbpn_dev *pnd;
 	u8 *data;
+	int phonet = 0;
 	int len, err;
 
 	data = intf->altsetting->extra;
@@ -355,10 +355,7 @@ int usbpn_probe(struct usb_interface *intf, const struct usb_device_id *id)
 					(struct usb_cdc_union_desc *)data;
 				break;
 			case 0xAB:
-				if (phonet_header || dlen < 5)
-					break;
-				phonet_header =
-					(struct usb_cdc_header_desc *)data;
+				phonet = 1;
 				break;
 			}
 		}
@@ -366,7 +363,7 @@ int usbpn_probe(struct usb_interface *intf, const struct usb_device_id *id)
 		len -= dlen;
 	}
 
-	if (!union_header || !phonet_header)
+	if (!union_header || !phonet)
 		return -EINVAL;
 
 	data_intf = usb_ifnum_to_if(usbdev, union_header->bSlaveInterface0);
-- 
1.7.4.1


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